I had a scheduled csection, I too was told it was medically necessary, and after going through an induced stillbirth I was happy I wasnt going to go through labor and birth again. Anyway my experience although not optional was great, in and out no problems and I have never felt like I was 'less' of a mother for having a csection.
Anyway back to your concern about antenatal classes, I too found that there wasnt much out there for csections so I didnt take a class. I read up on recovery and spoke with my ob about what would happen during and after, and got lots of info from bubhubbers. I went to a private hospital and the midwifes were great at teaching us how to case for baby once she was born.
In retrospect that was enough and we really didnt miss out on anything, are you worried about information about the surgery and recovery or about how to care for the newborn?